bracing for serious sibling rivalry at the super bowl. one the coach of the san francisco 49ers and the other couch of the baltimore ravens. here is cnn's john berman. >> wolf, it is brother against brother this sunday. what everyone is calling the har-bowl. how will it turn out for them? well, maybe there are some lessons. we decided to look back at pretty much all of the famous brothers in history. >> jim harbaugh. >> john harbaugh. >> coach, jim, john harbaugh, harbaugh. >> we've had a few fights, a few arguments, just like all brothers. >> like first brothers, meet cain, meet abel, see cain, kill abel. >> justice is a team sport. >> what does that mean? >> it means sports. football brothers. football brothers, hoops brothers, winkle brothers. >> i'm 6'5", 220, and there's two of them. >> what does that mean? >> it means jokes. morris brothers, stooge brothers. >> hello. >> what does that mean? >> it means power. emanuel brothers, castro brothers. castro brothers, bush brothers, kennedy brothers. >> be remembered simply as a good and decent man. we saw wrong and tried to righ